Accumulator of the step by step operated type



Aug. 30, 1949. c. DELAKE ET AL 2,480,744

ACCUMULATOR OF THE STEP BY STEP OPERATED TYPE Filed Feb. 19, 1948 5 Sheets-Sheet 1 FHZHT' mum INVENTORS (ILA/l? D. MIKE DONALD A. I U-77f M/CHAEL F/EHL WESLEY PFQFF ATTORNEY Aug. 30, 1949. c. D. LAKE ET AL 2,480,744

ACCUMULATOR OF THE STEP BY STEP OPERATED TYPE Filed Feb. 19, 1948 1 5 Sheets-Sheet 2 A INVENTORS my? 0. mm; DON/1Z0 re P/ATI' 5 M/cH/m F/[l/L 5' 5 WESLEY PHI/CF ATTORNE Y Aug. 30, 1949. c, D. LAKE ET AL ACCUMULATOR OF THE STEP BY STEP OPERATED TYPE 5 Sheets-Sheet 3 Filed Feb. 19, 1948 VENTORS I? 0 LA/(f DO/Y/QZD AD. P/Hrr M/CH/i'fl F/EHL WESLEY P/C/JFF BY ATTORNEY Aug. 30, 1949.

c. D. LAKE ET AL ACCUMULATOR OF THE STEP BY STEP OPERATED TYPE Filed Feb. 19, 1948 5 Sheets-Sheet 4 U F EMEA mmw w ma flw m v R w p/A m m m m PLUDMW w Am 1 8 EEE 2 m EE 5&5 w m U 525 E81 m 5 dm d vim Eda m 26 mw finz 13523 $5 @3152. -E u 01v JoEzoU 2 mg ESEE N 1 Q kmwwii dU Aug. 30, 1949. c. D. LAKE ET AL 2,480,744

ACCUMULATOR OF THE STEP BY STEP OPERATED TYPE- Filed Feb. 19, 1948 5 Sheets-Sheet 5 ATTORNEY Patented Aug. 30, 1949 UNITED STATES PATENT OFFICE ACCUMULATOR OF THE STEP BY STEP OPERATED TYPE New York Application February 19, 1948, Serial No. 9,498

6 Claims. 1

This invention relates generally to accumulating mechanisms for accounting machines and pertains more specifically to accumulators of the type which are operable step by step by successive electrical impulses.

An object of the invention is to provide an accumulator of the impulse controlled type which operates rapidly but efiiciently by effecting positive operation of the wheel actuating means without depending on springs and to reduce the possibility of mis-operations by overthrow of the parts resulting from the high speed operations.

Another object of the invention resides in the provision of ratchet-operated accumulator wheel actuating means which is positively reciprocated by an armature reciprocated by two magnets energized in succession.

A further object and feature of the invention pertains to the provision of an overthrow or looking means to lock the actuated ratchet wheel against the possibility of overthrow by the high speed operation.

Another object of the invention pertains to the provision of two impulse transmitting means which transmits in spaced relation groups of differentially timed electrical impulses to said magnets to effect successive unit operations of the accumulator wheel to enter the desired digit.

Another object of the invention is to construct an accumulator of the step-by-step operated type so that said groups of impulses are utilized to effect either addition, or subtraction by the complemental process, whereby for either type of entry operation the accumulator Wheel rotates step by step in the same direction.

Another object of the invention pertains to the provision of means to render said two impulse transmitting means effective to transmit groups of impulses to the two magnets before or after an impulse is derived under control of an entry control means, such as a key, or perforated record, whereby additive entry operations or subtractive entry operations by the complemental process may be selectively made.

which, in the case of addition, closes circuits to render said two impulsing means eliective when the wheel receives the first unit step of operation when the digit representation is sensed or received, and in the case of subtraction opens circuits to render said impulsing means ineffective when the digit representation is sensed or received.

Another object of the invention is to coordinate with the accumulator constructed according to the present invention a units carry means which is simpler than that heretofore devised.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In said drawings:

Fig. 1 is a view in side elevation of an assembled accumulating unit constructed according to the present invention.

Fig. 2 is a plan sectional view taken on the line 2--2 of Fig. 1.

Fig. 3 is an end View taken on the line 3-3 of Fig. 1.

Fig. 4 is a transverse sectional view taken on the line 44 of Fig. 1.

Fig. 5 is a longitudinal sectional View taken on the line 5-5 of Fig. 4, showin the details oi the digit readout unit.

Fig. 6 is a sectional view taken on the line 6-6 of Fig. 2 showing a contact operating mechanism.

Fig. 7 is a sectional view taken on the line l--| of Fig. 2 and shows a contact operating means associated with the units carry means.

Fig. 8 is a sectional view taken on the line 8-8 of Fig. 2 showing another contact operating means associated with the units carry means.

Fig. 9 is a timing diagram showing the timing of the electrical impulses.

Fig. 10 is a wiring diagram showing the electrical wiring connection of the instrumentalities employed for three orders of the accumulator constructed according to the present invention.

The parts and mechanism forming each of the accumulator units are carried by a support plate 20 which is mounted in a vertical plane in the machine. As is well known, to form a multidenominational amount receiving accumulator a plurality of such units are mounted side by side and electrically interconnected in a manner to be described so that units carries or transfers may be effected from each lower order accumulator means under control of an accumulator wheel wheel to the next higher order wheel. Carried oted on a stud 29. Pivoted on a stud carried by the lever 28 is an operating pawl 3| and said pawl is urged by a spring 32 which is extended from a tail of the pawl 3| to a .stud 33 "carriedby the lever 28, into engagement with a tooth 314 of a ratchet wheel 35.

It is evident that when the armature 23 is attracted by the core of the energized rock magnet 2| it will rock the lever 28 clockwise about its pivotal stud 29 and pawl 3| will be moved to the .right under the .now idle ratchet wheel 35 to engage the next toothtothe rightthereo'f. Insuch position the pawl .31 is in a position to rotate the ratchet wheel 35 clockwiseone-ratc'het toothwhen the .magnet 2| is .deenergized, and add magnet 22 is energized. When the add magnet 22 is energized after magnet'2l is .deenergized the increased tension of a spring 51 and the attraction -.,of armature .23 by the core of magnet 22 will positively rock the lever '28 counterclockwise to .effect the one-tooth rotation of ratchet wheel 35. In this manner a unit is entered for each reciprocation .o'filever 2.8,.

The accumulator wheel assembly .for each or- :der consists .of .an ad ratchet wheel 35, .a ratchet wheel 36 which is associated with the overthrow mechanism to'he described, a ratchet 4 it will be seen that a reduced end .of the shaft 43 .is .journaled in a bracket 44 which is carried by the plate 20. The plate 20 also carries a bushing 46 ,in-which is ,journaled an en- .largedport-ion 43 ofsaid shaft v43.

The overthrow mechanismconsists of aidetent lever .50 (Fig. l.) which is pivoted upon a stud 5|, said lever having .a :lug 52 engageable with a projection-53 of thelever 28. Pivoted onastud (55 is a retrograde preventing pawl 56 which cooperates with the ratchet wheel 3-1.. Atensioned :spring :51 is interconnected between tails .of the retrograde -pr.eventing pawl 56 and the overthrow preventing pawl 53, it ,being :obvious that the nor- .mal tension in the spring 51 .causes the overthrow preventing pawl 1.5!! to engage the [associated ratchet whee1 36 and the retrograde :preventing pawl 56 toeengage the associated ratchet wheel 31.

When the lever :28 is initially rocked clockwise extension 53 will engage thelug 52 and withdraw the overthrow preventing pawl 5Bout of engagement with the ratchet wheel 36, :this occurring at :the same time that the pawl .3:| slips under :to :engage the next tooth of the ratchet wheel 3.5. The attraction of armature 23 by .the energized add magnet .22 and the increased tension ofspringil rocks, as .previouslystated, the lever '28 :counterclockwiseand thus the overthrow preventing paw-1'50 is rocked by spring 51 to engage the next adjacent tooth of the ratchet wheel 36.

Lever 28 moves away slightly from the overthrow preventing pawl 50 as the overthrow preventing pawl 50 engages the ratchet wheel 36. This insures that the overthrow preventing pawl 250 is in the path of the next tooth of ratchet wheel 35 just before the-pawl 3| hasreached the limit of its travel in rotating the ratchet Wheel 35 clockwise one tooth space. The above operation is aeffectedzior each unit entry. Transmisfisionof successive groups of alternating impulses to magnets 2| and 22 will cause a repetition of the above fiescrlbed operations to either add, or

enter-complements of numbers and thus the accumulator unit will be advanced a number of steps commensurate with the number of effective groups of impulses transmitted to the mag- 'nets*2-| and 22. To enter a single digit only one impulse is transmitted to said magnet 2| and then a following impulse to magnet 22. To enter a digit 3, threegroups of impulses will be transmitted to'the magnets 2| and 22, and for-each group of impulses the first impulse istransmitted .to the magnet 2|, aml'then a following impulseto magnet 22.

Additive entry operations Any suitable type of digit entry control means may be provided to impulse the magnets -'Z-| and 22 so that bysuccessive'steps of operation-of each acccumulator-wheelthe desired digit will be additively entered therein. As illustrative of one form of entering control mechanism the present embodimentincludesmeans for effecting additive entries under control of a perforated record 60 shown in "Fig. 10. 'Therecord analyzing means is shown diagrammatically since it is well known in record controlled accounting machines. As is we'll known, .a differential location of a perforation determines the digital value. For the'illus- Ltrative form of .card a perforation atthe lower position of the card represents 9 in the units order, .a perforation at the 6 position represen'tsfi in the tensorder and aperfora'tionin the 4 position represents :4 in the highest .order. The entering means will best be understood :by reference to the wiring diagram of Fig. 10, it being noted that for purposes of simplicity only three denominational orders are .shown but obviously the .capacity may be increased according to the (entry requirements.

Ingeneral, for additive entries the first impulse which is transmitted to the magnet 2| to prepare for a unit entry is derived from the perforation in the column analyzed and a subsequent impulseiof the same group-from an impulse transmitting means to magnet 12 positively rocks the accumulator wheel actuating means so .as to actually effect this .unit entry. After receipt of "the first impulse under control of the card perforation .the entry .circuits vare so conditioned that successive groups of impulses are automatically transmitted in alternating sequence to magnets 2| and .22 to effect the subsequent steps .of operation .of the accumulator wheel until the desired digit has been entered.

.Eor conditioning the machine for addition under control of .a series of cards 60 which, as is well known, automatically and sequentially pass through the record analyzing means, a switch -.S| is closed which closes a circuit from the line 6|, through CR3 cam contacts, SI switch now closed, .R-lrelay to ground, the latter being energized .for the period of closure of the CR3 cam contacts shown in .Fig. .9 to close the respective a, b and c contacts. It is pointed out that the cam cone,4ao,744.

tacts designated CR are contacts which are continually closed and opened in each entry cycle according to the cam formations, the timing thereof beingshown in Fig. 9. Cam contacts CR3, for example, keep the R+ relay energized during the time that the 9-1 perforations in the card are being analyzed. The circuit for energizing the magnet 2| for the units column to enter 9 is from the line 6|, circuit breaker contacts CBI, CLa card lever contacts (which, as is well known, are physically closed by the cards as they pass through the machine but are opened between feeding of successive cards), common contact roll 62, brush 63 for the units column, plug connection 64, R+a relay contacts now closed, wire 65, thence through RCa contacts now in normal position, magnet 2| to ground. Thus, upon sensing the 9 perforation the magnet2| is energized to rock the lever 28 to condition the wheel actuating mechanism preparatory to turning the accumulator wheel one step. It should be noted with reference to Fig. 9 that CB| circuit breaker impulses coincide in time of closure with the time that the card perforations are sensed. After the circuit to energize magnet 2| is opened by the opening of the CBI contacts, or the passage of the hole away from the brush 63, CR2 cam contacts subsequently close to transmit an impulse to the magnet 22 by a circuit which extends from line 6|, through CR2 cam contacts, Rg relay contacts now in normal position, magnet 22 of all denominational orders, to ground. Hence, the units order magnet 22 will be energized to rock the lever 28 clockwise and effect a unit movement of the accumulator wheel.

In the same manner sensin of the perforation in each other order will effect the first unit entry. The circuits pertaining to-the order in which an entry has been made are nowconditioned so that subsequent groups of impulses will be transmitted to magnets 2| and 22 automatically to continue with the successive steps of units entry.

Referring now to Fig. 6 pivoted upon a support rod 66 is a double arm 61 having a depending projection 68 coacting with the ratchetv teeth of ratchet wheel 31. The left end of thearm 61 carries a block 69 of insulating material which normally overlies a spring blade of'contacts III. the wheel 31 the tooth in engagement with pro- J'ection 68 will act as a cam to rock the lever 61 counterclockwise to close'contacts 10 and said arm 6'! will be latched in rocked position by having the right terminal end of the arm 61 engaged by a latching notch H of a spring-operated latching bell crank 12 which is loosely pivoted upon a rod 13. Once contacts '19 are closed they will remain closed until the termination of the successive steps of operation of an wheel. Referring now to Fig. 10 and understandin that contacts 10 are now closed in the units order it will be seen that an impulse circuit is closed from the line 6|, through CRI cam contacts;

. is transmitted by the'CRZ .cam contacts to magnet Upon the first clockwise step of rotation. of

accumulator 999530 would be entered in the accumulator.

22 by the circuit previously described. Thus, it will be seen that after the first units step of operation of an accumulator wheel, groups of impulses are transmitted, one impulse first by cam contacts CRI to magnet 2|, and thereafter the next impulse of the same group is transmitted by CR2 to 'magnet 22. In the assumed example after the units step of operation of the accumulator wheel upon sensing the 9 hole, eight groups of pulses will be transmitted to magnets 2| and 22 of the units order to effect eight additional steps of operation of the accumulator wheel to ultimately enter a 9 digit in the units order.

To effect the entry of 6 in the tens order the same operation is effected by the circuits just described and correspondingly the 4 entry is made in the hundreds order.

It will be seen that for the entry of 6 and 4 in the tens and hundreds order cam contacts CR2 will transmit one or more pulses to the magnet '22 before the respective 4 and 6 entry units are initiated but such pulses are idle and are ineiiective until the impulse is transmitted to magnet 2| when the card hole is sensed.

Also it should be noted that before a card hole is sensed CR2 cam contacts will attempt to transmit impulses to the magnet 2| in each order but it cannot do so until the contacts 19 are closed.

Subtraction entries The machine may also be conditioned to effect substraction of amounts represented by a series of cards. Subtracting operations are performed by the complemental process, that is to say, a digit is entered in each order which is the 9s complement of the represented digit. For example, to enter 469 subtractively the number As will be explained the 9s at the left of the significant digit 1-9 of the highest denominational order are entered because in such orders zeros are represented. Also for all zeros in a number a 9 will be entered.

To efi'ect complemental subtraction switch S| is opened and switch S2 is closed which will complete an obvious circuit through CR4 cam contacts to hold the R relay energized. The latter relay transfers the a, b, c and 9 contacts and closes the d, e and f contacts. Transfer of the Rg relay contacts places the CR5 cam contacts in circuit connection with all of the magnets 22 of each denominational order. It will be noted that in additive entry operations the impulses from CR| were directed to the magnet 2| while in subtracting operations, due to the transfer of R-g relay contacts, the impulses from CRI are transmitted to the magnets 22 and therefore are adding impulses. The impulse circuit for each magnet 22 is from the line 6!, through CRI cam contacts, R--g relay contacts now transferred to the plurality of magnets 22.

The manner in which complemental subtraction is effected will best be understood in connection with Fig. 1, the timing diagram of Fig. 9 and the wiring diagram of Fig. 10. There will now be considered the manner in which 9s are entered in each of the denominational orders where a O is represented on the card, which would be the case for the denominational orders to the left of the significant digit 1-9 of the represented number, and orders in which zeros of a number are represented.

In adding operations, the impulses to magnets 22 from cam contacts CR2 were frock impulses but in subtraction they have an adding func tion since they are directed to the magnets 2|.

There is an attempt to normally enter 9 in all of the denominational orders by the impulses transmitted by cam contacts CR2 and after each impulse by cam contacts CR2 there is a following impulse by cam contacts CR] and each group of such impulses will operate the accumulator wheel a step so that in the absence of a hole representing 1-9 a 9 will be entered. The circuit for transmitting impulses for normally enterin 9 is from line 6|, through cam contacts CR2, contacts 83 which are normally closed at 'the beginning of each subtraction entering operation, through Ra, b, contacts now transferred, the RCa, b, 0 contacts now normal, then to each magnet 2|. The manner in which con tacts 89 are normally closed will be best understood by reference to Fig. 1. Pivoted on the rod '66 is a double arm 8| and such arm is normally rocked by a spring 82 so that its terminal end 83 will be caught and latched by a shoulder 84 of a bell crank 85 also pivoted on the rod 13 and drawn to latching position by a spring 86. In such latched position of the double arm 8|, contacts 8B are closed.

Referring to Fig. 9 it will be seen that cam contacts CR? will transmit 9 timed impulses to the magnet 2| and alternately CRI cam contacts will transmit 9 timed impulses, one impulse, after each impulse transmitted by CR2. These groups of impulses will operate the accumulator actuating mechanism to normally enter a 9 when a 0 is represented in any order.

Considering how the operation when a digit 1-9 is represented by a hole, it will be seen that upon sensing of the hole a circuit will be closed from line Ell, through CBI cam contacts, CLa card lever contacts, card contact roll 62, brush 63, plug connection 64, Rd relay contacts for the units order, wire 88, to a subtraction control magnet 98. Such magnet, referring to Fig. 1, will attract a depending armature extension 91 of the double arm BI and unlatch it from the latching bell crank 25, the latter now being rocked by spring 85 so to latch double arm Si in clockwise position. In such clockwise position contacts 80 will be open, thereby preventing,

after sensing of a card hole, further impulses by CR2 cam contacts to magnet 2! of the units order. Where a 9 is represented, such as herein in the units order, contacts 82 of such order will immediately be opened and there will be no operation of the accumulator wheel in the units order. In the tens order where a 6 is represented three groups of impulses will be transmitted by CR! and CR2 cam contacts after which contacts 86 of the tens order will be open to prevent further entry operation of the accumulator while in this order. In the tens order only 3 units will be entered which is the 9s complement of 6. Similarly, in the hundreds order a 5 digit will be entered by a step-by-step operation of the accumulator wheel until the 4 hole is sensed.

It is also required to enter a fugitive unit in the units order when the highest denominational order wheel passes from 9 to 0. This fugitive unit entry means is not shown herein since it is well known in the art and merely requires that when the highest order wheel passes from 9 to 0 it operates the units order carry mechanism to enter a unit therein to convert the nines complement entry in the units order to a tens complement entry.

arm 92 counterclockwise.

contacts 93.

unit to this order.

Units carry means The units carry means provides for the entry of a unit to an accumulator wheel when the next lower order wheel passes from 9 to 0. The carry means consists of electrical circuits which operate in a well known manner. For this reason it will only be generally explained and only in as much detail as is necessary to understand how the present accumulator actuating means is utilized to efiect units carries.

In Fig. 8 cam 39 is shown to carry two cam projections 39a and 3% which are alternately effective at each half revolution of the accumulator wheel when it passes from 9 to 0 to rock a double Arm 92 is also pivoted on rod 66 and when rocked by either cam projection 39a or 3912 will close units carry control Contacts 93 may close during an accumulator entry operation and are latched closed by a spring-operated bell crank latch 94.

Referring to Fig. 10 it will be seen that when cam contacts CR! close the RC relay will be energized by an obvious circuit so as to transfer its a, b, 0 contacts, thus preparing the carry circuits for units carry operations. The units carry impulse to energize a magnet 2| of the next highest denominational order is transmitted when cam contacts CR6 close. Assuming that the units order wheel has passed from 9 to 0 the carry circuit for the tens order is from the line 6 l through CR6 cam contacts, REd relay contacts now closed, wire 95, contacts 93U of the units order, now closed, through RCb relay contacts now transferred, to magnet 2| of the tens order to ground. This will condition the accumulator wheel actuating means to prepare for a unit movement of the tens order accumulator Wheel.

When additive entries are being effected it will be recalled that the CR2 cam contacts transmit an impulse to the magnet 22 and for carry operations the last impulse transmitted by this cam, designated 91 in Fig. 9, will transmit an impulse to magnet 22 which actually efiects the units carry.

In subtracting operations by the complemental process the units carries are also required and they will operate in exactly the same manner as has just been described. The impulse circuit to the magnet 22 to actually effect units carry when subtracting by the complemental process is the same because the R- relay is deenergized to restore Ra-g contacts to normal position before the unit carry circuits are operative.

Provision is also made, as is customary, to concurrently effect a carry to a still higher order if this order stands at 9 and a units carry causes the next lower order wheel to pass from 9-0. This is performed under control of the customary 9 contacts which are closed when a wheel is standing at 9. Referring to Fig. '7 cam 38 is provided with projections 38a and 381) which are alternately effective at each half revolution of the accumulator wheel when it represents 9 to rock an arm I02 and close the 9s contact I03. If such contact M311 is closed in the hundreds order it will be seen that the impulse circuit from contacts 93U of the hundreds order is immediately extended through contacts "13H, and the RC0 relay contacts now transferred, and thence to the magnet 2| of the hundreds order, thus carrying a Thus, it is not necessary to wait until contacts 93T are closed to effect a carry and carries in a plurality of orders are concurrently efiected under such circumstances.

It is, of course, necessary to restore to normal air-scan the arm 92 (Fig. 8) 1: it has been latched during an entry operation for effecting carries, and also restore arm 6! (Fig. 6) to normal. To this end a magnet I05 attracts its armature I06 and the latter, by cooperation with a tail I01 of the latching arm 12, wil1 rock the same counterclockwise to unlatch the arm 61. Referring to Fig. 8 the armature I06 also engages a tail I08 of the latch arm 94 to rock the latter to unlatch double arm 92.

Incidentally, the energization of the magnet I05 also engages a tail I09 (Fig. 1) of the latch member 85 and rocks the same counterclockwise to disengage it from the right end of the arm 8|.

Arm 8| is now rocked by the spring 82 so as to again close contacts which are now normally held in latched position as previously described.

The circuit for energizing the magnet I for all of the denominational orders is under control of a cam CR8 which transmits a single impulse to the magnets I05 of all denominational orders at the time shown in Fig. 10.

Total readout means structure fits over a flattened portion II! of the '5 right-hand end of shaft 43 and is secured thereto by a screw H8. The wiper structure consists of wipers H9 and I20, one of which makes contact with a common conducting segment I2I as the other wiper makes contact with digit represent-*' ing contact points which are carried by plate H5. There is a diagrammatic showing of the readout R0 in Fig. 10 and associated electrical connections. Emitter EM shown in Fig. 10 transmits a series of differentially timed impulses (see Fig. 9) to the digit representing contact points to thereby transmit diflerentially timed digit representing impulses selected according to the contact point I22 contacted by a wiper, to print control magnets I23. A plurality of print control mag-" nets is provided, one for each denominational order, and each is energized by a differentially timed digit representing impulse when print control switches S4, S5 and S6 are moved to the dotted line position. For printing a total standing on the accumulator, reciprocable type bars may be provided, as is well known in record controlled accounting machines (see patent to G. F. Daly, No. 1,921,454), and print control magnets I05 stop the type bars at differential positions in order to print from selected digit type representing the total. This type of printing mechanism is well known and, therefore, is not shown herein.

Resetting of the accumulator In general, resetting of the accumulator is effected when a switch S3 is closed so as to energize the RE relay during the time that cam contacts CR5 are closed. RE reset relay will close the a, b and c relay contacts and open its REd relay contacts. Opening of the latter opens the carry impulse circuit under control of the CR6 cam contacts to prevent improper units carries.

Resetting is efiected, in general, by transmitting difl'erenti'ally timed impulses by the emitter EM to each'order of the readout but which impulses are the tens complement of the digit representation in each order. To this end the RE relay transfers its 1-4 and 6-9 relay contacts and opens the 0 relay contacts. For example, if there should be a 9 digit representation in the units order it will be seen that transfer of the REI contacts will cause an impulse from EM emitter representing the digit 1 to be transmitted through REI relay contacts now transferred, wire I24, wiper structure II6 now in contact with the 122-9 contact point in the units order, conducting segment I2 I, S4 switch now in full line position, through REa relay contacts now closed, wire 65, RCa relay contacts now in normal position, to magnet 2|. A later impulse transmitted to magnet 22 by the CR2 cam contacts will actually effect the units advance of the accumulator wheel, now bringing it to 0 position. When the wiper structure H5 in the units order occupies the 0 position no impulse can be transmitted by the EM emitter because of open contacts RED and the accumulator wheel will remain at 0. The principle of operation for resetting any accumulator wheel from any total digit representing position to zero is precisely the same except that when it is necessary to reset a wheel to zero by a plurality of steps, alternating impulses from the EM emitter (or CRI) and CR2 cam contacts are utilized. For example,

when an accumulator represents a 4 digit an impulse is sent to magnet 2| by a similar circuit when the emitter brush strikes the 6 contact point. A following impulse from CR2 cam contacts to magnet 22 advances the wheel a unit to the 5 digit position and at the same time contacts it are closed. In the manner previously described five groups of alternating impulses to the magnets 2I and 22 in succession turn the accumulator wheel five more steps, to bring the wheel to zero. It should be noted that the time of transmission of impulses from CRI and EM coincide (see Fig. 9).

While there have been shown and described and pointed out the fundamental novel features of the invention, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the following claims:

What is claimed is:

1. In an accounting machine, an accumulator wheel advanced step by step, actuating means for said wheel moved in one direction preparatory to an advance of said wheel a step, and in the other direction to actually advance said wheel one step, a pair of magnets, armature means attracted by said magnets for moving said actuating means in the two directions as said magnets are energized in succession, a pair of normally ineffective impulse transmitting means for transmitting impulses to said magnets in succession, means to transmit a digit representing impulse to energize the magnet which moves said actuating means in said one direction, and means under control of said energized magnet to render said impulse transmitting means effective to energize said magnets in succession to effect a repeated operation of said actuating means to advance said wheel step by step until a digit represented by the digit representing impulse has been entered.

2. In an accounting machine, an accumulator wheel advanced step by step to receive a digit entry, actuating means for said "wheel moved one direction preparatory to an advance of said wheel one step, and in the other direction to actually advance said Wheel one step, a pair or magnets, means attracted by said -magnets .ior moving said actuating means in the two directions as the magnets are energized in alternating succession, a pair of impulse transmitting for transmitting impulses to energize said :magnets in alternating succession, the impulse transmitting means which energizes the magnet which moves said actuating means in said one direction being normally ineffective, means for transmitting a digit representing impulse to energize said magnet which moves said actuating means said one direction, and means responsive to the transmission-of said digit representing impulse to render said ineffective impulse transmitting means effective.

3. In an accounting machine, an-accumulator wheel advanced step by step to receive a digit entry, actuating means for said wheel moved in one direction preparatory to anadvance of said wheel one step, and in the other direction-to actually advance said wheel one step, -a .pair of magnets, means attracted by said-magnets when energized for moving-said actuating means in the two directions as the magnets are energized in alternating succession, a pair of impulse transmitting means for transmitting impulses tosaid magnets in alternating succession to advance said wheel step by step, means 'for transmitting a digit representing impulse, and means responsive to the transmission of said digit representing impulse to render the impulse transmitting means which energizes the magnet which moves said actuating means in said onedirecticn ineffective.

4. In an accounting machine for selectively effecting addition or subtraction by the :complemental process, an accumulator wheel advanced step by step to receive a true digit, or the complement of a digit, actuating means for said wheel moved in one direction preparatory to -an advance of said wheel a step, and in the other direction to actually advance said wheel one step, a pair of magnets, armaturemeans attracted by said magnets for moving said actuating means in the two directions said magnets are energized in succession, a pair of A and B impulse transmitting means for transmitting impulsesto said magnets in alternating succession, means for transmitting a digit representing impulse, selectively operated means operable when addition is to be performed to cause said digit representing impulse to energize said magnet which movessaid actuating means in said one direction and to then render said A and B impulse transmitting means effective to energize said magnets in succession to effect a repeated operation of said actuating means to advance said accumulator wheel step by step until the true digit has been entered, and other selectively operated means op- .erable when subtraction is to be per-formed to cause said A and B impulse transmitting means .to transmit impulses to said magnets in succession but reversely with respect to when additionis to bezperformed, to effecta repeated operation of said actuating means to advance the accumulator wheel step by step prior to the transmission of said digit representing impulse, and to thereafter render the impulse transmitting means which moves said actuating means in said one direction ineifective when the digit representing impulseis transmitted, whereby said accumulator wheel is no further advanced .stepby step, and has received a complement digit entry.

5. In an accounting machine, a counting wheel of the ratchet type, a pawl cooperating with said ratchet wheel, a pair of magnets, armature means attracted by said magnets, means operated by said armature when attracted by one energized magnet to move said pawl idly in one direction preparatory to the advance of the ratchet wheel,

and move said pawl in another direction in cooperation with said ratchet wheel to advance the latter one step, a pair of impulse transmitting means forttransmitting impulses to said magnets in alternating-succession, the impulse transmitting means which energizes the magnet which moves said pawl idly in said one direction being normally ineffective, and means responsive to the transmission of a digit representing impulse to render said ineffective impulse transmitting means efiective.

6. In an accounting machine, a counting wheel of the ratchet type,a pawl cooperating with said counting wheel, a pair of magnets, armature means attracted by said magnets, a lever carrying said pawl and operated by said armature when'attracted by one energized magnet to move said pawl idly in one direction preparatory to the advance of the ratchet wheel a step, and move said lever and pawl in another direction whereby said' pawl, in cooperation with 'said ratchet wheel, advances the latter one step, -a

pair of impulse transmitting means for transmitting alternating {impulses to energize said magnets in succession, a supplemental ratchet 'wheel rotatable with the counting ratchet wheel, an overthrow preventing lever normally cooperating with said supplemental ratchet wheelyand means cooperating with said first namedlever and said overthrow preventing lever to cause the latter, by the movement of the first named lever and pawl in'said one direction, to be disengaged from said supplemental ratchet wheel, and spring means-effective to :rock said overthrow preventing lever to be placed in the path of the next tooth of said supplemental ratchet wheel prior to the time said pawl has rotated the counting ratchet wheel a complete step.

CLAIR D. LAKE. DONALD R. PIATT. MICHAEL FIEHL. WESLEY PFAFF.

No references cited. 

